Following Channels are supported in Salesforce Einstein BOT.

1. SMS(Long Code, Short Code, Toll-Free)
2. Facebook
3. Chat(LiveAgent)
4. Messaging for In-App and Web
5. WhatsApp

We can connect Salesforce Einstein BOT to the above channels to assist the customers with frequently and less complex questions.

Please check the following for setup and implementation.

https://www.infallibletechie.com/tag/salesforce-einstein-bot